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<title>GNU Scientific Library &ndash; Reference Manual: Atomic and Nuclear Physics</title>

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<a name="Atomic-and-Nuclear-Physics"></a>
<div class="header">
<p>
Next: <a href="Measurement-of-Time.html#Measurement-of-Time" accesskey="n" rel="next">Measurement of Time</a>, Previous: <a href="Astronomy-and-Astrophysics.html#Astronomy-and-Astrophysics" accesskey="p" rel="previous">Astronomy and Astrophysics</a>, Up: <a href="Physical-Constants.html#Physical-Constants" accesskey="u" rel="up">Physical Constants</a> &nbsp; [<a href="Function-Index.html#Function-Index" title="Index" rel="index">Index</a>]</p>
</div>
<hr>
<a name="Atomic-and-Nuclear-Physics-1"></a>
<h3 class="section">44.3 Atomic and Nuclear Physics</h3>
<a name="index-atomic-physics_002c-constants"></a>
<a name="index-nuclear-physics_002c-constants"></a>
<dl compact="compact">
<dt><code>GSL_CONST_MKSA_ELECTRON_CHARGE</code></dt>
<dd><p>The charge of the electron, <em>e</em>.
</p>
</dd>
<dt><code>GSL_CONST_MKSA_ELECTRON_VOLT</code></dt>
<dd><p>The energy of 1 electron volt, <em>eV</em>.
</p>
</dd>
<dt><code>GSL_CONST_MKSA_UNIFIED_ATOMIC_MASS</code></dt>
<dd><p>The unified atomic mass, <em>amu</em>.
</p>
</dd>
<dt><code>GSL_CONST_MKSA_MASS_ELECTRON</code></dt>
<dd><p>The mass of the electron, <em>m_e</em>.
</p>
</dd>
<dt><code>GSL_CONST_MKSA_MASS_MUON</code></dt>
<dd><p>The mass of the muon, <em>m_\mu</em>.
</p>
</dd>
<dt><code>GSL_CONST_MKSA_MASS_PROTON</code></dt>
<dd><p>The mass of the proton, <em>m_p</em>.
</p>
</dd>
<dt><code>GSL_CONST_MKSA_MASS_NEUTRON</code></dt>
<dd><p>The mass of the neutron, <em>m_n</em>.
</p>
</dd>
<dt><code>GSL_CONST_NUM_FINE_STRUCTURE</code></dt>
<dd><p>The electromagnetic fine structure constant <em>\alpha</em>.
</p>
</dd>
<dt><code>GSL_CONST_MKSA_RYDBERG</code></dt>
<dd><p>The Rydberg constant, <em>Ry</em>, in units of energy.  This is related to
the Rydberg inverse wavelength <em>R_\infty</em> by <em>Ry = h c R_\infty</em>.
</p>
</dd>
<dt><code>GSL_CONST_MKSA_BOHR_RADIUS</code></dt>
<dd><p>The Bohr radius, <em>a_0</em>.
</p>
</dd>
<dt><code>GSL_CONST_MKSA_ANGSTROM</code></dt>
<dd><p>The length of 1 angstrom.
</p>
</dd>
<dt><code>GSL_CONST_MKSA_BARN</code></dt>
<dd><p>The area of 1 barn.
</p>
</dd>
<dt><code>GSL_CONST_MKSA_BOHR_MAGNETON</code></dt>
<dd><p>The Bohr Magneton, <em>\mu_B</em>.
</p>
</dd>
<dt><code>GSL_CONST_MKSA_NUCLEAR_MAGNETON</code></dt>
<dd><p>The Nuclear Magneton, <em>\mu_N</em>.
</p>
</dd>
<dt><code>GSL_CONST_MKSA_ELECTRON_MAGNETIC_MOMENT</code></dt>
<dd><p>The absolute value of the magnetic moment of the electron, <em>\mu_e</em>.
The physical magnetic moment of the electron is negative.
</p>
</dd>
<dt><code>GSL_CONST_MKSA_PROTON_MAGNETIC_MOMENT</code></dt>
<dd><p>The magnetic moment of the proton, <em>\mu_p</em>.
</p>
</dd>
<dt><code>GSL_CONST_MKSA_THOMSON_CROSS_SECTION</code></dt>
<dd><p>The Thomson cross section, <em>\sigma_T</em>.
</p>
</dd>
<dt><code>GSL_CONST_MKSA_DEBYE</code></dt>
<dd><p>The electric dipole moment of 1 Debye, <em>D</em>.
</p></dd>
</dl>





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